Make raspberry syrup: Place raspberries in a medium-sized bowl.,Add the sugar and lime juice and mash with the back of a wooden spoon.,Let sit for 10 minutes.,Strain the mixture through a fine sieve to remove seeds and set aside.,______,Add 3/4 cup sparkling water to each glass and stir to combine.,If using vodka, add 1/4 cup (or less to taste) to each glass, stir to combine, and top with 1/2 cup of sparkling water.,Garnish glasses with fresh raspberries and lime wedges, if desired.,Enjoy with Strawberry-Tomato Salsa.